550621 has 2 divisors, whose sum is σ = 550622. Its totient is φ = 550620.

The previous prime is 550609. The next prime is 550631. The reversal of 550621 is 126055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290521 + 260100 = 539^2 + 510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550621 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275310 + 275311.

It is an arithmetic number, because the mean of its divisors is an integer number (275311).

2⁵⁵⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

550621 is a deficient number, since it is larger than the sum of its proper divisors (1).

550621 is an equidigital number, since it uses as much as digits as its factorization.

550621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 550621 is about 742.0384087094. The cubic root of 550621 is about 81.9629517350.

Adding to 550621 its reverse (126055), we get a palindrome (676676).

The spelling of 550621 in words is "five hundred fifty thousand, six hundred twenty-one".